Safety control for cutting machines



March 27, 1934. F. w. sEYBoLD SAFETY CONTROL FOR CUTTING MACHINES FiledFeb. 15, 1932 2 Sheets-Sheet at Arroz/v: rs

March 27, 1934. F, w, SEYBOLD 1,952,291

SAFETY CONTROL FCR CUTTING MACHINES Filed Feb. l5, 1932 2 Sheets-Sheet 29 ZM ALM/M Arraewsys .y

Patented Mar. 27, 1934 UNITED STATES PATENT oFFIcE 1,952,291 SAFETYCONTRGL FOR CUTTING MACHINES Frederick W.. Seybold, Dayton, Ohio,assignor to Harris- Seybold-Potter Company, Cleveland,

hands is completely eliminated.

Another object of the invention is the automatic control of the safetymeans on Vthe upstroke of the knife so that it is unnecessary for theoperator to continue to operate the controls after the knife reaches thecutting stick.

Another object of the invention is the provision of means for stoppingthe knife mechanism 'almost instantly at any point in its descent shouldthe operator release either one of the hand con- 0 trois.

A further obiect is the provision of electrical means for controllingthe safety mechanism.

Other Vobjects and features of novelty will appear as I proceed with thedescription of that embodiment of the invention which, for the purposesof the present application, I have illustrated in the accompanying.drawings, in which Fig. l is a rear elevational view, somewhatdiagrammatic in character, of a paper cutter embodying the invention,and including a wiring diagram of the electrical control parts of themachine;

Fig. 2 is a vertical sectional detail View taken substantially on theYline 2-2 of Fig. 1, showing a roller clutch which may be employed forconnecting or disconnecting the knock-out cam and a rotating element ofthe knife mechanism;

Fig. 3 is aside elevational View of the machine;

Fig. 4 is a plan view of the machine. brake and vits operating means;

Fig. 5 is a fragmental front elevational view out for the knifemechanism; and

Fig. 6 is a side elevational view of the same. Y In the drawings, theframe of the machine is indicated at I0.. It supports a table l1 uponwhich is mounted the usual back gauge 12 which may be moved along thetable by any suitable means, as, for instance, by handwheel 13 carryinga sprocket wheel upon which runs a chainv 14 that is connected with theback gauge in the usual way. There is also indicated at 15\theconventional paper clamp. Upon opposite sides of the machine arevertical guides'lG within which the knife bar' 1'7 is mounted toreciprocate.

` ward to the cutting stick and then upward again of the machine showinga conventional knock- Below the table 11, and preferably in verticalalignment with the knife bar 17,. there is a crankshaft 18, whichcarrieson its opposite ends crank pins 19 that are joined to the knifebar by connecting rods 20, so that for each revolution of the crankshaft18 the knife makes a complete cycle of movements from the top of itsstroke, or its position of rest illustrated in the drawings, downto itsposition of rest, at which point the con-- ventional knock-out mechanismstops its movement.

At the rear end of the machine there is a short shaft 2l upon which aremounted a flywheel 22 and a pulley 23. The pulley is adapted to bedriven by a belt from any convenient power source, such,4 for example,as an electric motor. To the opposite end of the short shaft 2l there isattached one element 24 of a friction clutch, the other element 25 ofwhich is secured to a shaft 26 aligned with the Yshaft 2l. The shaft 26near its opposite end carries also a brake drum 27 which is surroundedby a pair of brake shoes 28 that are pivotally mounted at 29 upon abracket 30 bolted to thel frame of the machine. At their 'upper endsthese shoes carry rotatable pins 30 and 31 parallel to each other and tothe shaft 26. A screw' 32 with an operating handle 33 extends through asmooth hole in pin 31 and is threaded in pin 30. A spiral spring 34surrounds the screw 32 between its handle 33 and the pin 31, therebyexerting pressure to draw the brake shoes together and to cause them tobear frictionally upon the brake drum 2'7. By adjustment of the screw,the tension of spring 34 may be varied as desired.

On the right-hand extremity of shaft 26a's viewed in Fig. 1, there ismounted a' pinion 35 which meshes with a gear 36 mounted on the shaft3'?. The latter shaft carries another gear 38 ofsmaller size whichmeshes with a large gearg on shaft 18, the latter gear carrying one ofthe crank pins 19 previously'referred to. In this manner driving forcefrom the relatively high speed shaft 26 is transmitted to shaft 18 at arelatively 'low speed and correspondingly increased torque.

Obviously, when the clutch elements 24, 25 are disengaged and the brakeshoes 28 are set to frictionally engage the brake drum, the shaft 26 andthe knife bar 17 will be stationary. It will also` be obvious that whenthe clutch members 24,. 25 are engaged and the brake released, the shaft26 will turn and driving force' will be transmitted to the crank-shaft18 through the train of gears 35, 36, 38 and 39'.

In order to effect simultaneously the engagement of the clutch 24, 25and the disengagement of the brake 27, 28, or the disengagement of theclutch and the engagement of the brake, a shipper bar 40 is slidablymounted above the shaft 26. This bar is adapted to be shifted hack andforth by a hand lever 4l located at the front of the machine in aposition convenient to the operator. This lever is secured to a rockshaft 42 extending from the front to the back of the machine andcarrying at its rear end a short crank 43 with a yoke straddling the bar46 between two collars 44 that are secured to the bar. There is alsosecured to the bar 46 at a short distance to the right of the clutch 24,25, as viewed in Fig. 1, an arm 45 having a yoke at its lower endstraddling a collar 46 which is slidahly keyed to the shaft 26. Thiscollar carries a wedge pin or finger 47 that is adapted to set theclutch when shifted to the left, as viewed in Fig. 1. The details of theclutch construction are not herein disclosed, the presy ent invention isnot concerned therewith.

The shipper bar 40 extends above the brake drum 27 between. theupperends of the brake shoes 28. Beyond the bracket 48 in which the bar 40 isslidably mounted, the latter has attached thereto a collar 49 having apair of wedge fingers 56 integrally attached thereto and adapted tospread the brake shoes 2S in opposition to the force of spring 34 whenthe shipper 40 is moved toward the left in Fig. 1, thereby releasing thebrake. The collar 49 also has formed in one side thereof a V-shapednotch 5l. which is adapted to receive a roller detent when the shipperbar is in its normal inoperative position illustrated in the drawings.The detent 52 is'resiliently pressed toward the collar 49 by a springmounted in a cylinder 53, or otherwise, riding up the rear side of thenotch 51 onto a nat plate 54 integrally formed upon the collar 49, whenthe bar 46 is shifted toward the left. The detent 52 prevents anyaccidental movement of the shipper bar 4() toward the left, and hence isa safety device.

In Figs. 5 and 6 I have shown, somewhat diagrammatically, a conventionalknock-out arrangement for stopping the knife mechanism when the knifebar reaches its position of rest. On the righthand end of crankmshaft18, as viewed from the front of the machine in Fig. 5, there is a crankplate 99 carrying one of the cranks 19. This piate has a knock-out cani91 on its periphery. Secured to the forward end of rock shaft 42, or tothe handle 41 on that shaft, there is a knock-out arm 92, upon the lowerextremity of which is an anti-,friction roller 93 which is adapted to beengaged by the cain 91 when the arm 92 is swung the proper distancetoward the right from the positionv indicated in Fig. 5. Y

All of the parts of the machine thus far described are known and incommon use. The added features constituting the present invention eitherper se or in combination with the known features of the machine 'willnow be described.

On'the shipper bar 49 there is secured at the proper position adepending dog 55 having an anti-friction roller 56 thereon. This roller56 is adapted to be shifted toward the right by a knock-out cam 57 whenthe shipper bar is in its operative'position to the left of that shownin Fig. 1, and `also when the knock-out cam 57 is locked to the shaft26. When the cam is not locked to the shaft, the latter turns freelywithin the cam, gravity acting upon the wider and heavier part of thecam tion. Means are provided, however, for locking the cam 57 to theshaft at times when it is desirable or necessary for the machine tostop, and in the present instance this means takes the form of a rollerclutch shown in detail in Fig. 2. This roller clutch comprises ahardened collar 58 which is keyed to shaft 26. Opposite this collar, theclutch casing, which is free to turn with respect to shaft 26 and issecured to or integral with knock-out cam 57, carries two segments 59and 60 having ilat hardened surfaces facing the collar. Coil springs 61tend to force hardened rollers 62 into position between the sectors 59and 66 and the collar 58 so as to lock these parts together. The actionof the coil springs 61 may be opposed, however, by slide bars 63. Thesebars are adapted to be moved inwardly toward the springs by screws 64which are threaded in the housing of the clutch and bear at their innerextremities upon the outer ends of the slide bars 63. These bars neartheir outer ends are engaged by pins 65 by means of which they aresteadied and guided. The screws 64 are provided with outwardlyprojecting extensions which are clamped within links 66 outside thecasing of the clutch. To these links are pivotally attached connecting'rodspr links 67. 'Ihe latter are pivotally connected 'to lateralextensions 68upon a collar 69 free to turn upon the shaft 26.

A yoke on the upper end of bell-crank lever 70 runs in the collar 69.This lever is pivoted at 72 on a bracket "I3 attached to the frame ofthe machine. The other arm of the lever is oonnected to a' soft ironcore movable within a solenoid 74 which, when energized, holds the lever70 in the position illus.rated in Fig.` 1. A coil spring 75 works inopposition to the solenoid and acts to pull the lever toward the rightwhen the solenoid is deenergized. In the position of the parteillustrated in the drawings, the screws 64 are turned to their inwardlimit of motion, pushing'the slide bars 63 inwardly to force the rollers62 out of locking engagement, thereby leaving the collar 58 free to turnwithin the sectors 59 and 69. When the solenoid 74 is deenergized,however, the spring 75 immediately pulls the lever 70 to the right,causing the links 67 and 66 to turn the screws 64 so as to back themoff, whereupon the springs 61 force the rollers 62 into jamming positionbetween the collar 58 and the sectors 59 and 66. The knock-out cam 57 isthen locked to the collar 58 which is keyed to the shaft, and actsimmediately toforce the dog 55 toward the right to disconnect the clutch24, 25 and set brake 27, 28, thereby stopping the knife travel.

Now, while it is appreciated that mechanical means might be employed formoving the lever 79 upon its pivot to control the roller clutch and thuseffect the operation of the knock-out cam at the proper time,particularly for stopping the knife at the top of its stroke, I preferto employ electrical means now to be described, this means also lendingitself especiallywell to the purpose of operating the knock-out as asafety control during the descent of the knife on the cutting stroke.

Referring now to Fig. l, 80 and 81 are electric conductors fordelivering current to the solenoid 74. Conductor 81 leads directly tothesolenoid while conductor 80 is connected with the solenoid through oneof two parallel circuits. The first of these parallel circuits includesa conductor 82, a push button or other switch 83 preferably to hold itagainst rotamounted upon the handle ofnleverw41, fa second All that itis necessary to do in that event is to unhook one end of spring 75.Thereafter the knock-out 57 will hang loosely upon the shaft 26 at alltimes, whether or not the buttons 83 and 84 are depressed or the switch87 closed. In fact the electric current to line 80, 81 may be turnedorf.

In the foregoing description I have necessarily gone somewhat intodetail in order to explain fully the particular embodiments of theinvention herein illustrated, but I desire it to be understood that suchdetail disclosures are not to be construed as amounting to limitationsexcept as they may be included in the appended claims.

Having thus described my invention, I claim:

1. In a cutting machine, power driven mechanism for causing the cuttingknife to descend from its position of rest to make the cut and then riseagain to its position of rest, a hand control member for setting saidmechanism into operation, a separate control member for actuation by theother hand of the operator, means for interrupting the action of saidknife mechae nism promptly upon the removal of either of the operatorshands from said control members during the descent of the knife, andmeans for interrupting the action of said knife mechanism when the knifeupon its ascending movement ar rives again at the position of rest.

2. In a cutting machine, power driven mechanism for causing the cuttingknife to descend from its position of rest to make the cut and then riseagain to its position of rest, a hand control memher for setting saidmechanism into operation, means tending to interrupt the action of saidknife mechanism, manual control means adapted to interfere with theaction of said interrupting means during the descent of the knife, andmeans associated with the knife mechanism for automatically interferingwith the action of said interrupting means during the rising movement ofthe knife.

in a cutting machine, power driven mechanism for causingthe cuttingknife to descend from its position of rest to make the cut and then riseagain to its position of rest, a hand control member for setting saidmechanism into operation, means tending to. interrupt the action of saidknife mechanism, separate controls for the two hands of the operatoradapted to interfere with the action of said interrupting means duringthe descent of the knife, and means associated with the knife mechanismfor automatically interfering with the action of said interrupting meansduring the rising movement of the knife.

4. In a cutting machine, power driven mechanism for causing the cuttingknife to descend from its position of rest to make the cut and then riseagain to its position of rest, means for setting said mechanism intooperation, means tending to interrupt the action of said knifemechanism, and electrical means comprising two hand switches formaintaining interrupting means ineffective during the descent of theknife and comprising a switch automatically actuated by the knifemechanism during the upward movement of the knife for maintaining thesaid interrupting means ineffective.

5. In a cutting machine, power driven mechanism for causing the cuttingknife to descend from its position of rest to make the cut and then riseagain to its position of rest, means for starting said mechanism andmaintaining it in operation until `the knife descends to make the cutand returns to said position of rest, said means comprising anelectrical circuit, and manually operated control means for holding thecircuit closed until the descent of the knife is completed, andautomatically operated means for holding;i the circuit closed during theupward travel only of the knife.

6. In a cutting machine, power driven mechanism for causing the cuttingknife to descend from its position of rest to make the cut andcf thenrise again to its position of rest, means for starting said mechanismand maintaining it in operation until the knife descends to make the cutand returns to said position of rest, said means comprising an electriccircuit, two separated man-1 -90 ually operated switches for holding thecircuit'" closed until the descent of the knife is completed, andautomatically operated means for holding the circuit closed during theupward travel only of the knife. .95

7. In a cutting machine, a knife, a crank-shaft operatively connectedwith said knife for causing the latter to descend from its position ofrest, make the out, and return to its position of rest, all during onerevolution of said crank-shaft, 10U means for driving said crank-shaftcomprising a second shaft tui-:ning at a relatively high rate of speed,control means for starting and stopping said second named shaft, andmeans associated with said second named shaft for operating said,control means to stop the knife mechanism before. said high speed shafthas completed one revolution whenever the operator removes his hand fromsaid control means during the descent of the knife. l1() 8. In a cuttingmachine, a knife, a crank-shaftvoperatively connected with said knifefor causing the latter to descend from its position of rest, make thecut, and return to its position of rest all during one revolution ofsaid crank-shaft, means for driving said crank-shaft comprising a` vlsecond shaft turning at a relatively high rate of speed, control meansfor starting and stopping said second named shaft, a knock-outoperatively associated with said control means, means operativelyassociated with said second named shaft" for actuating said knock-out tocause the control means to stop the knife mechanism, said last namedmeans being actuated to-operate said knock-out whenever the operatorremoves his hand from said control means during the downward travel ofthe knife.

9. In a cutting machine, a knife, a crank-shaft operatively connectedwith said knife for causing the latter to descend from its position ofrest, 13 make the cut, and return to its position of rest all during onerevolution of said crank-shaft, means for driving said crank-shaftcomprising a second shaft turning at a relatively high rate of speed,control means for starting and stopping 13 second named shaft, aknock-out operatively associated with said control means, meansoperatively associated with .said second named shaft for actuating saidknock-out to cause the control means to stop the knife mechanism, saidlast 14 named means being actuated to operate said knocknout wheneverthe operator removes his hand from said control means during thedownward travel of the knife and being actuated automaticaily at the endof the upward travel of the 14 knife.

l0. In a cutting machine, a knife, a crank-shaft operatively connectedwith said knife for causing the latter to descend from its position ofrest, make the cut, and return to its position of rest 15 all during onerevolution of said crank-shaft, means for driving said crank-shaftcomprising a second shaft turning at a relatively high rate of speed,control means for starting and stopping said second named shaft, aknock-out operatively associated with said control means, meansoperatively associated with said second named shaft for actuating saidknock-out to cause the control means to stop the knife mechanism, andelectrical means for controlling said last named means, said electricalmeans including a switch to be held in a given position by the operatoruntil the knife has completed its descent.

11. In a cutting machine, a knife, a crank-shaft operatively connectedwith said knife for causing the latter to descend from its position ofrest, make the cut, and return to its position of rest all during onerevolution of said crank-shaft, means for driving said crank-shaftcomprising a second shaft turning at a relatively high rate of speed,control means for starting and stopping said second named shaft, aknock-out operatively associated with said control means, meansoperatively associated with said second named shaft for actuating saidknock-out to cause the control means to stop the knife mechanism, andelectrical means for controlling said last named means, said electricalmeans including a switch to be held in a given position by the operatoruntil the knife has completed its descent and including also a switchautomatically held by the knife mechanism in a given position during theupward travel of the knife.

12. In a cutting machine, power driven mechanism for causing the cuttingknife to descend from its position of rest to make the cut and then riseagain to its position of rest, means for starting said mechanism andmaintaining it in operation until the knife descends to make the cut andreturns to said position of rest, said means comprising an electriccircuit, manually operated means for holding the circuit closed untilthe descent of the knife is completed, and automatically operated meansin shunt with said manually operated means, said automatically operatedmeans serving to hold the circuit closed during the upward travel of theknife.

13. In a cutting machine, a knife, power driven mechanism for causingthe knife to descend from its position of rest, make the cut, and moveupwardly again to its position of rest, a longitudinally movable shipperbar for starting and stopping said mechanism, a dog on said bar, saidmechanism comprising a driven shaft located near said shipper bar, aknock-out loosely mounted cn said shaft, a clutch between said shaft andknock-out, and means for setting said clutch to cauce said knock-ont toshift said dog and thereby move said shipper bar to stop said mechanism.

le. In a cutting machine, a knife, power driven mechanism for causingthe knife to descend from its position of rest, make the cut, and moveupwardly again tc its position of rest, a longitudinally movable shipperbar for starting and stopping said mechanism, a dog on said bar, saidmechanism comprising a driven shaft located near said shipper bar, aknock-out loosely mounted on said shaft, a clutch between said shaft andknock-out, means for setting said clutch to cause .said knock-cut toshift said dog, and electrical means for maintaining said clutch settingmeans ncrrnally inoperative.

l5. In a cutting machine, a knife, power drivineclianism for causing theknife to descend from position of rest, make the cut, and move upwardlyagain to its position of rest, a shipper bar for starting and stoppingsaid mechanism, a dog' on said bar, said mechanism comprising a drivenshaft located near said shipper bar, a knock-out loosely mounted on saidshaft, a clutch between said shaft and knock-out, means for setting saidclutch to cause said knock-out to shift said dog, electrical means formaintaining said clutch setting means inoperative, said electrical meanscomprising a manually operable switch effective during the downwardtravel of the knife and an automatic switch effective during the upwardtravel of the knife back to said position of rest.

FREDERICK W. SEYBOLD.

